Note 8 - Shareholders' Equity (Details Textual) - shares		3 Months Ended
	Mar. 10, 2016	May 31, 2021	May 31, 2020	Jul. 01, 2021	Jan. 08, 2015	Jan. 07, 2015
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares)					1,250,000
Stock Repurchase Program, Percentage of Outstanding Shares Authorized to be Repurchased						6.00%
Common Stock, Shares, Outstanding, Ending Balance (in shares)						20,945,634
Stock Repurchase Program, Number of Additional Shares Authorized to be Repurchased (in shares)	1,000,000
Stock Repurchased During Period, Shares (in shares)		0	137,397
Subsequent Event [Member]
Stock Repurchase Program, Percentage of Outstanding Shares Authorized to be Repurchased				6.80%
Common Stock, Shares, Outstanding, Ending Balance (in shares)				20,384,126
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased (in shares)				1,394,015